First go to Home Depot and buy some 72" Bamboo Plant Stakes. They come in a 6 pack. Buy as many as you like expecting to get 3-4 usable shafts per bag.
You will also want to pickup some 16D Duplex Nails.
In this picture you can see where you want to have the cut for the nock end in relation to the Bamboo node.
Some people like to straighten the nodes first. Some like to do the mid section first. It does not seem to matter either way so choose which one you like. I start with the nodes.
I take my heat gun and place it under the node while spinning the shaft. Once the section I am heating gets hot enough the Bamboo will bend very easy. Just bend it as straight as possible and move on to the next node.
I do not have a spine meter so this is how we will be doing it.
Thanks and enjoy!